Log smooth deformation theory via Gerstenhaber algebras
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We construct a k[[Q]]-linear predifferential graded Lie algebra L∙X0/S0 associated to a log smooth and saturated morphism f0:X0→S0 and prove that it controls the log smooth deformation functor. This provides a geometric interpretation of a construction in Chan et al. (Geometry of the Maurer-Cartan equation near degenerate Calabi-Yau varieties, 2019. arXiv:1902.11174) whereof L∙X0/S0 is a purely algebraic version. Our proof crucially relies on studying deformations of the Gerstenhaber algebra of polyvector fields; this method is closely related to recent developments in mirror symmetry.
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Manuscripta mathematica, 167, Springer, Berlin u.a., 2022, https://doi.org/10.1007/s00229-020-01255-6